A 40-year-old man has been arrested after allegedly posting an Internet listing seeking “secret sexual adventure with girls while their parents are away.”

Alexander Herbert Gibson is being held at the Arapahoe County Jail on suspicion of Internet luring of a child, according to the Arapahoe County Sheriff’s Office.

Investigators with the sheriff’s office Internet Crimes Against Children unit, posing as a 13-year-old girl, communicated with the suspect on the Internet and he allegedly “described explicit sexual conduct and detailed how he wanted to engage in sexual intercourse with the 13-year-old,” the sheriff’s office said in a media release.

Gibson was arrested Thursday when he arrived in the area of a home where he believed the 13-year-old would be alone, the release said.

Gibson is being held in lieu of a $50,000 bond.

The sheriff’s office said “several items of evidence were located on Gibson’s person, as well as in his vehicle.”

Kieran Nicholson covers breaking news for The Denver Post. He started at the Post in 1986, at the old building on 15th and California streets. Nicholson has covered a variety of beats including suburbs, courts, crime and general assignment.